llvm

a62b86a3 - [AArch64,ELF] Restrict MOVZ/MOVK to non-PIC large code model (#70178)

[AArch64,ELF] Restrict MOVZ/MOVK to non-PIC large code model (#70178) There is no PIC support for -mcmodel=large (https://github.com/ARM-software/abi-aa/blob/main/sysvabi64/sysvabi64.rst) and Clang recently rejects -mcmodel= with PIC (#70262). The current backend code assumes that the large code model is non-PIC. This patch adds `!getTargetMachine().isPositionIndependent()` conditions to clarify that the support is non-PIC only. In addition, add some tests as change detectors in case PIC large code model is supported in the future. If other front-ends/JITs use the large code model with PIC, they will get small code model code sequence, instead of potentially-incorrect MOVZ/MOVK sequence, which is only suitable for non-PIC. The sequence will cause text relocations using ELF linkers. (The small code model code sequence is usually sufficient as ADRP+ADD or ADRP+LDR targets [-2**32,2**32), which has a doubled range of x86-64 R_X86_64_REX_GOTPCRELX/R_X86_64_PC32 [-2**32,2**32).)