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[AArch64] merge index address with large offset into base address
A case for this transformation, https://gcc.godbolt.org/z/nhYcWq1WE Fold mov w8, llvm#56952 movk w8, #15, lsl #16 ldrb w0, [x0, x8] into add x0, x0, 1036288 ldrb w0, [x0, 3704] Only LDRBBroX is supported for the first time. Fix llvm#71917 Note: This PR is try relanding the commit 32878c2 with fix crash for PR79756 this crash is exposes when there is MOVKWi instruction in the head of a block, but without MOVZWi
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