[cmake] Remove MSVC C4800 override

Remove C4800 : ''type' : forcing value to bool 'true' or 'false' (performance warning)' from the list of forced disabled warnings.

I'm not seeing any regressions in VS2017/VS2019 llvm/clang builds from removing this.

Differential Revision: https://reviews.llvm.org/D61730

llvm-svn: 360417

llvm/cmake/modules/HandleLLVMOptions.cmake

@@ -519,7 +519,6 @@ if (MSVC)
       -wd4503 # Suppress ''identifier' : decorated name length exceeded, name was truncated'
       -wd4624 # Suppress ''derived class' : destructor could not be generated because a base class destructor is inaccessible'
       -wd4722 # Suppress 'function' : destructor never returns, potential memory leak
-      -wd4800 # Suppress ''type' : forcing value to bool 'true' or 'false' (performance warning)'
       -wd4100 # Suppress 'unreferenced formal parameter'
       -wd4127 # Suppress 'conditional expression is constant'
       -wd4512 # Suppress 'assignment operator could not be generated'