[GlobalISel] Add G_ASSERT_SEXT
This adds a G_ASSERT_SEXT opcode, similar to G_ASSERT_ZEXT. This instruction signifies that an operation was already sign extended from a smaller type. This is useful for functions with sign-extended parameters. E.g. ``` define void @foo(i16 signext %x) { ... } ``` This adds verifier, regbankselect, and instruction selection support for G_ASSERT_SEXT equivalent to G_ASSERT_ZEXT. Differential Revision: https://reviews.llvm.org/D96890
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