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Prologue emission, in some cases, requires calls to a stack probe helper function. The amount of stack to probe is passed as a register argument in the Win64 ABI but the instruction sequence used is pessimistic: it assumes that the number of bytes to probe is greater than 4 GB. Instead, select a more appropriate opcode depending on the number of bytes we are going to probe. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230270 91177308-0d34-0410-b5e6-96231b3b80d8
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