[FastISel][X86] Refactor constant materialization. NFCI.

Split the constant materialization code into three separate helper functions for
Integer-, Floating-Point-, and GlobalValue-Constants.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215586 91177308-0d34-0410-b5e6-96231b3b80d8