[PATCH] Demote EmitRawText call in AsmPrinter::EmitInlineAsm() and remove hasRawTextSupport() call

[Daniel Sanders]

  Here's my patch, but there's a problem with it.

  As-is, it causes ~50 test failures. The ones I've looked at so far are generally due to directives such as .foo_directive or .bork_directive in inline assembly. I could go through and change each test to use valid assembly, but I think a better solution would be to have isIntegratedAsDefault() and useIntegratedAs() as the predicates and then have an equivalent to -no-integrated-as force useIntegratedAs() to return false. This is the same model as clang uses.

  The effective change to the plan we previously discussed is that there is a way to force the use of EmitRawText() using -no-integrated-as. The default behaviour where targets with mature MC's always parse inline assembly remains the same.

http://llvm-reviews.chandlerc.com/D2686