SILOptimizer: fix a compiler crash when optimizing a global variable with an empty tuple. #36447
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…empty tuple. Instead create the empty tuple value. In general, it's not a good idea to create undef values in SIL.
…contain "undef" Fixes a compiler crash rdar://75364429
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The first fix is in GlobalOpt: bail is the initializer instructions of a global variable contain "undef"
But also fix SILMem2Reg to not create an "undef" as a replacement of a load of an empty tuple.
In general, it's not a good idea to create undef values in SIL.
https://bugs.swift.org/browse/SR-14342
rdar://75364429