Rollup merge of #153285 - DeepeshWR:codegen-llvm-sqrt-call-1.94, r=folkertdev

Update call-llvm-intrinsics test for Rust 1.94.0 IR

Rust 1.94 now passes constants directly to llvm.sqrt.f32 instead of
storing/loading via the stack.

- Updated the FileCheck pattern to match the new IR:
    // CHECK: call float @llvm.sqrt.f32(float 4.000000e+00)
  The test intent is unchanged: it still ensures the intrinsic is
  emitted as a 'call' (not 'invoke').

- Removed unnecessary local variables and Drop usage to work in
  `#![no_core]` mode with minicore.

- Added required crate attributes:
    #![feature(no_core, lang_items)]
    #![no_std]
    #![no_core]

- Replaced `//@ only-riscv64` (host-based execution) with explicit
  revisions for:
      riscv32gc-unknown-linux-gnu
      riscv64gc-unknown-linux-gnu
  This ensures deterministic multi-target coverage in CI without
  relying on the host architecture.

- Added `//@ needs-llvm-components: riscv` and
  `//@ min-llvm-version: 21` for CI compatibility.

Fixes rust-lang/rust#153271

Author: JonathanBrouwer