X86Vector: remove rsqrt Integration test

[cota]

Summary

This integration test (i.e. running the generated bitcode) is causing
more trouble than it's worth. We just want to ensure that the
right intrinsic (@llvm.x86.avx.rsqrt.ps.256) is called; what happens
afterwards (i.e. what LLVM generates and on what hardware it runs)
does not concern us and we therefore should not test it.

Given that an existing test in mlir/test/Target/LLVMIR/x86vector.mlir
already checks that we generate the right intrinsic, delete this
integration test.

[aartbik]

Bye old friend!

[cota]

After discussing with Mehdi and Aart, I'm withdrawing this change in favor of https://reviews.llvm.org/D111461

mlir/test/Integration/Dialect/Vector/CPU/X86Vector/test-rsqrt.mlir

-// RUN: mlir-opt %s -convert-vector-to-llvm="enable-x86vector" -convert-std-to-llvm | \
-// RUN: mlir-translate --mlir-to-llvmir | \
-// RUN: %lli --entry-function=entry --mattr="avx" --dlopen=%mlir_integration_test_dir/libmlir_c_runner_utils%shlibext | \
-// RUN: FileCheck %s
-
-func @entry() -> i32 {
-  %i0 = constant 0 : i32
-
-  %v = std.constant dense<[0.125, 0.25, 0.5, 1.0, 2.0, 4.0, 8.0, 16.0]> : vector<8xf32>
-  %r = x86vector.avx.rsqrt %v : vector<8xf32>
-  // `rsqrt` may produce slightly different results on Intel and AMD machines: accept both results here.
-  // CHECK: {{( 2.82764, 1.99951, 1.41382, 0.999756, 0.706909, 0.499878, 0.353455, 0.249939 | 2.82812, 1.99976, 1.41406, 0.999878, 0.707031, 0.499939, 0.353516, 0.249969 )}}
-  vector.print %r : vector<8xf32>
-
-  return %i0 : i32
-}