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Use a dummy private function with inline asm calls instead of module level asm blocks for CFI jumptables. The main advantage is that now jumptable codegen can be affected by the function attributes (like target_cpu on ARM). Module level asm gets the default subtarget based on the target triple, which is often not good enough. This change also uses asm constraints/arguments to reference jumptable targets and aliases directly. We no longer do asm name mangling in an IR pass. Differential Revision: https://reviews.llvm.org/D28012 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290384 91177308-0d34-0410-b5e6-96231b3b80d8
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