pulley: Implement get_frame_pointer
#9658
Open
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This commit implements the CLIF
get_frame_pointer
instruction which will be needed by trampolines in Wasmtime. This is implemented by generalizing the preexistingGetSp
MInst
into a "get special". This the additionally removes the extendedget_sp
opcode in Pulley as it's not necessary asxmov
can operate on this register.