Request for reviews (M): 6932091: JSR 292 x86 code cleanup

[Christian Thalinger]

http://cr.openjdk.java.net/~twisti/6932091/webrev.01/

Some code cleanups found during the JSR 292 SPARC port.

Additionally TaggedStackInterpreter is disabled when MethodHandles are
enabled as the MethodHandles code does not support
TaggedStackInterpreter.

src/cpu/x86/vm/methodHandles_x86.cpp
src/cpu/x86/vm/templateTable_x86_32.cpp
src/cpu/x86/vm/templateTable_x86_64.cpp
src/share/vm/c1/c1_LIRGenerator.cpp
src/share/vm/prims/methodHandles.hpp
src/share/vm/runtime/arguments.cpp