x86-64: Remove calling_convention.txt.
It just details the x86-64 calling convention. No need for this in Mesa.
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Register Usage
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rax temporary register; with variable arguments passes information
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about the number of SSE registers used; 1st return register
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rbx* callee-saved register; optionally used as base pointer
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rcx used to pass 4th integer argument to functions
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rdx used to pass 3rd argument to functions 2nd return register
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rsp* stack pointer
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rbp* callee-saved register; optionally used as frame pointer
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rsi used to pass 2nd argument to functions
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rdi used to pass 1st argument to functions
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r8 used to pass 5th argument to functions
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r9 used to pass 6th argument to functions
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r10 temporary register, used for passing a function's static chain pointer
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r11 temporary register
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r12-15* callee-saved registers
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xmm01 used to pass and return floating point arguments
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xmm27 used to pass floating point arguments
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xmm815 temporary registers
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mmx07 temporary registers
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st0 temporary register; used to return long double arguments
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st1 temporary registers; used to return long double arguments
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st27 temporary registers
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fs Reserved for system use (as thread specific data register)
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*) must be preserved across function calls
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Integer arguments from list: rdi,rsi,rdx,rcx,r8,r9,stack
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Floating point arguments from list: xmm0-xmm7
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