[llvm-lib] Ignore /VERBOSE flag

Ignore the flag for now, but we can start using it for verbose output if needed.

Reviewed By: thakis

Differential Revision: https://reviews.llvm.org/D130202

llvm/lib/ToolDrivers/llvm-lib/Options.td

@@ -48,3 +48,4 @@ def nodefaultlib: P<"nodefaultlib", "">;
 def nodefaultlib_all: F<"nodefaultlib">;
 def nologo : F<"nologo">;
 def subsystem : P<"subsystem", "">;
+def verbose : F<"verbose">;