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[RISCV] Support fast calling convention

Description

[RISCV] Support fast calling convention

LLVM may annotate the function with fastcc if there has only one caller
and there're no other caller out of the module and the function is not
naked or contain variable arguments.

The fastcc functions could pass the arguments by the caller saved registers.

Differential Revision: https://reviews.llvm.org/D68559

Details

Committed
shivaOct 14 2019, 7:04 PM
Differential Revision
D68559: [RISCV] Support fast calling convention
Parents
rL374856: [WebAssembly] Trapping fptoint builtins and intrinsics
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