[WebAssemblyLowerEmscriptenEHSjLj] Avoid lifetime of phi (#150932) After #149310 lifetime intrinsics require an alloca argument, an invariant that this pass can break. I've fixed this in two ways: * First, move static allocas into the entry block. Currently, the way the pass splits the entry block makes all allocas dynamic, which I assume was not actually intended. This will avoid unnecessary SSA reconstruction for allocas as well, and thus avoid the problem. * If this fails (for dynamic allocas) drop all lifetime intrinsics if any one of them would require a rewrite during SSA reconstruction. Fixes https://github.com/llvm/llvm-project/issues/150498.
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