Latest AFL does not build with trace-pc, but does compile with trace-pc-guard.

[972/1745] LINK ./re2c
FAILED: re2c 
../../third_party/llvm-build/Release+Asserts/bin/clang++ -Wl,--fatal-warnings -fPIC -Wl,-z,noexecstack -Wl,-z,now -Wl,-z,relro -fuse-ld=gold -B../../third_party/binutils/Linux_x64/Release/bin -Wl,--threads -Wl,--thread-count=4 -m64 -pthread -Wl,-O1 -Wl,--gc-sections --sysroot=../../build/linux/debian_wheezy_amd64-sysroot -L/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/lib/x86_64-linux-gnu -Wl,-rpath-link=/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/lib/x86_64-linux-gnu -L/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib/x86_64-linux-gnu -Wl,-rpath-link=/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib/x86_64-linux-gnu -L/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib/gcc/x86_64-linux-gnu/4.6 -Wl,-rpath-link=/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib/gcc/x86_64-linux-gnu/4.6 -L/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib -Wl,-rpath-link=/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib -fsanitize=address -fsanitize-address-use-after-scope -fsanitize-coverage=trace-pc -Wl,-rpath-link=. -Wl,--disable-new-dtags -Wl,-rpath=\$ORIGIN/. -Wl,-rpath-link=. -Werror -Wl,-u_sanitizer_options_link_helper -fsanitize=address -fsanitize-address-use-after-scope -fsanitize-coverage=trace-pc -stdlib=libc++ -Wl,-rpath,\$ORIGIN/ -L. -o "./re2c" -Wl,--start-group @"./re2c.rsp" ./libc++.so -Wl,--end-group  -ldl -lrt 
../../third_party/yasm/source/patched-yasm/tools/re2c/dfa.c:10: error: undefined reference to '__sanitizer_cov_trace_pc'
../../third_party/yasm/source/patched-yasm/tools/re2c/actions.c:23: error: undefined reference to '__sanitizer_cov_trace_pc'
../../third_party/yasm/source/patched-yasm/tools/re2c/dfa.c:20: error: undefined reference to '__sanitizer_cov_trace_pc'
../../third_party/yasm/source/patched-yasm/tools/re2c/actions.c:25: error: undefined reference to '__sanitizer_cov_trace_pc'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
[973/1745] LINK ./mkpeephole
FAILED: mkpeephole 
../../third_party/llvm-build/Release+Asserts/bin/clang++ -pie -Wl,--fatal-warnings -fPIC -Wl,-z,noexecstack -Wl,-z,now -Wl,-z,relro -fuse-ld=gold -B../../third_party/binutils/Linux_x64/Release/bin -Wl,--threads -Wl,--thread-count=4 -m64 -pthread --sysroot=../../build/linux/debian_wheezy_amd64-sysroot -L/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/lib/x86_64-linux-gnu -Wl,-rpath-link=/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/lib/x86_64-linux-gnu -L/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib/x86_64-linux-gnu -Wl,-rpath-link=/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib/x86_64-linux-gnu -L/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib/gcc/x86_64-linux-gnu/4.6 -Wl,-rpath-link=/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib/gcc/x86_64-linux-gnu/4.6 -L/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib -Wl,-rpath-link=/usr/local/google/home/aarya/build/chromium/src/build/linux/debian_wheezy_amd64-sysroot/usr/lib -fsanitize=address -fsanitize-address-use-after-scope -fsanitize-coverage=trace-pc -Wl,-rpath-link=. -Wl,--disable-new-dtags -Wl,-rpath=\$ORIGIN/. -Wl,-rpath-link=. -Werror -Wl,-O1 -Wl,--gc-sections -Wl,-u_sanitizer_options_link_helper -fsanitize=address -fsanitize-address-use-after-scope -fsanitize-coverage=trace-pc -stdlib=libc++ -Wl,-rpath,\$ORIGIN/ -L. -o "./mkpeephole" -Wl,--start-group @"./mkpeephole.rsp" ./libc++.so -Wl,--end-group  -ldl -lrt 
../../buildtools/third_party/libc++/trunk/include/ostream:746: error: undefined reference to '__sanitizer_cov_trace_pc'
../../buildtools/third_party/libc++/trunk/include/ios:747: error: undefined reference to '__sanitizer_cov_trace_pc'
../../v8/src/interpreter/bytecodes.cc:61: error: undefined reference to '__sanitizer_cov_trace_pc'
../../buildtools/third_party/libc++/trunk/include/ostream:752: error: undefined reference to '__sanitizer_cov_trace_pc'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c584ddf6b18583daebdc8f02f9ea9b50fb36dbae

commit c584ddf6b18583daebdc8f02f9ea9b50fb36dbae
Author: inferno <inferno@chromium.org>
Date: Mon Jan 30 19:26:07 2017

Roll AFL 2.31b:2.38b and switch coverage to use trace-pc-guard.

TBR=dpranke@chromium.org
BUG= 684077 

Review-Url: https://codereview.chromium.org/2662883002
Cr-Commit-Position: refs/heads/master@{#447032}

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Fixed with latest clang roll.