DxilContainerValidation.cpp has some int / bool comparisons that cause
default error warnings in some of the private builds. This needs to be
addressed. This PR changes the comparisons by converting the numerical
expressions into the appropriate boolean, then comparing the booleans.

When targeting arm64 Debug, this error is detected:
libclang\dxcrewriteunused.cpp(1,1): error C1128: number of sections
exceeded object file format limit: compile with /bigobj
This PR adds a compile option for the folder that contains
dxcrewriteunused.cpp, so that the limit on the number of sections is
increased, and compilation may succeed.

Cherry picked from
#7228

This PR changes some code in ExecutionTests.cpp to use the wide string
variants of Windows API calls explicitly. This is because some internal
builds will get confused about which overload to resolve the
GetModuleHandle function to. By being explicit, this should eliminate
the error that an arg can't be converted to LPCWSTR.

Cherry picked from
#7235

Brings in these PRs:

#7272 [PIX] Add a pass for PIX to log missing NonUniformResourceIndex
usage into a UAV.
#7238 [PIX: Check for existing PIX UAV in roots sigs before adding it
again.

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Co-authored-by: nopandbrk <202358470+nopandbrk@users.noreply.github.com>
Co-authored-by: Chris B <cbieneman@microsoft.com>