Taking care of review comments.
authortijoytk <tijoytk@microsoft.com>
Mon, 9 May 2016 23:23:52 +0000 (16:23 -0700)
committertijoytk <tijoytk@microsoft.com>
Mon, 9 May 2016 23:23:52 +0000 (16:23 -0700)
commitbe670ac7633d451e21667cd5cf0716d94ff3baf8
treee46d10c7f10ec2dd080bc6fb7649216d2ce4aa72
parente3ba4b5ba1eb71a21b39edd8d0689c4720ff7f1d
Taking care of review comments.
Let out some of the review comments
since they are optimizations.

Commit migrated from https://github.com/dotnet/coreclr/commit/515a28b8ab33675011af9923bb5b6dfedf5e3935
src/coreclr/src/mscorlib/src/System/StubHelpers.cs
src/coreclr/src/vm/fieldmarshaler.cpp
src/coreclr/src/vm/marshalnative.h
src/coreclr/tests/src/Interop/StringMarshalling/UTF8/UTF8Test.cs
src/coreclr/tests/src/Interop/StringMarshalling/UTF8/UTF8TestNative.cpp