[TargetLowering] Fix the problem of emulated-TLS implementation witho… (#101490)

For a __thread variable x, when emulated TLS is enabled and there is an
access to x, the compiler first looks up the symbol __emutls_v.x within
the module. However, the issue arises with an alias y of x, the compiler
still tries to look up __emutls_v.y instead of __emutls_v.x. As a
result, the lookup returns a nullptr, causing the compiler to crash. The
purpose of this MR (Merge Request) is to ensure that in emulated TLS,
before checking __emutls_v.y, the compiler first identifies which global
value y is an alias of.

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