RFR: 8296916: RISC-V: Move some small macro-assembler functions to header file

[Feilong Jiang]

On Mon, 14 Nov 2022 02:19:30 GMT, Fei Yang <fyang at openjdk.org> wrote:

> Witnessed that there are some small macro-assembler functions located in file macroAssembler_riscv.cpp.
> These are small functions which mostly contain only a single line of code. We should move them to the
> corresponding header file so that they have a chance to be inlined.
> 
> Testing: Tier1 on linux-riscv64 HiFive unmatched board.

src/hotspot/cpu/riscv/assembler_riscv.hpp line 2757:

> 2755:   // Bit-manipulation extension pseudo instructions
> 2756:   // zero extend word
> 2757:   void zext_w(Register Rd, Register Rs) {

Seems we can move `zext_w` to MacroAssembler too.

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PR: https://git.openjdk.org/jdk/pull/11130