[x86] add tests for maxnum/minnum with nnan; NFC
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[ms] [llvm-ml] Implement the statement expansion operator
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Creating a named struct requires only a Context and a name, but looking up a struct by name requires a Module. The method on Module merely accesses the LLVMContextImpl and no data from the module itself, so this patch moves getTypeByName to a static method on StructType that takes a Context and a name.
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