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[Clang][RISCV] Support half-precision floating point for RVV intrinsics.

Authored by HsiangKai on Jun 27 2021, 10:38 PM.

Description

[Clang][RISCV] Support half-precision floating point for RVV intrinsics.

Use _Float16 as the half-precision floating point type. Define a new
type specifier 'x' for the _Float16 type.

Differential Revision: https://reviews.llvm.org/D105001