Hi, 

I want to get d8 code coverage report. 
I add "-fprofile-instr-generate -fcoverage-mapping" to toolchain.ninja 
like this
```
rule cxx
  command =  ../../third_party/llvm-build/Release+Asserts/bin/clang++ -MMD 
-MF ${out}.d ${defines} ${include_dirs} -fprofile-instr-generate 
-fcoverage-mapping ${cflags} ${cflags_cc} -c ${in} -o ${out}
  description = CXX ${out}
  depfile = ${out}.d
  deps = gcc
```
but still can't get any coverage data after I recompile d8 and run it. 

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