[PATCH] fast-isel: remove dead code after falling back from selecting call instructions (PR20863)

[Hans Wennborg]

Hi rnk,

Previously, fast-isel would not clean up after trying but failing to select a call instruction, because it would have called flushLocalValueMap() which moves the insertion point, making SavedInsertPt in selectInstruction() invalid. We can fix this by making SavedInsertPt a member variable, and having flushLocalValueMap() update it.

This removes some redundant code at-O0, and more importantly fixes PR20863. Please take a look!

http://reviews.llvm.org/D5249

Files:
  include/llvm/CodeGen/FastISel.h
  lib/CodeGen/SelectionDAG/FastISel.cpp
  test/CodeGen/X86/fast-isel-x86.ll
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