[StableHLO][NFC] Enable pow e2e test on llvm-cpu (iree-org#13792)

This test is disabled on rv32 due to known issues with the musl lib. I
checked the generated code and it looks identical to the mhlo output
now.

Issue: iree-org#12678

build_tools/cmake/test_riscv.sh

@@ -83,6 +83,7 @@ if [[ "${RISCV_PLATFORM}-${RISCV_ARCH}" == "linux-riscv_32" ]]; then
   # mhlo.power is also disabled because musl math library is not compiled for
   # 32-bit.
   test_exclude_args+=(
+    "stablehlo.*llvm-cpu.*pow"
     "xla.*llvm-cpu.*pow"
   )
 fi

tests/e2e/stablehlo_ops/BUILD.bazel

@@ -58,6 +58,7 @@ iree_check_single_backend_test_suite(
             "multiply.mlir",
             "negate.mlir",
             "pad.mlir",
+            "pow.mlir",
             "reduce.mlir",
             "reduce_window.mlir",
             "remainder.mlir",
@@ -81,9 +82,7 @@ iree_check_single_backend_test_suite(
             "while.mlir",
         ],
         include = ["*.mlir"],
-        exclude = [
-            "pow.mlir",  # TODO(#12678): Investigate this failing on riscv-32.
-        ],
+        exclude = [],
     ),
     compiler_flags = ["--iree-input-type=stablehlo"],
     driver = "local-task",

tests/e2e/stablehlo_ops/CMakeLists.txt

@@ -49,6 +49,7 @@ iree_check_single_backend_test_suite(
     "multiply.mlir"
     "negate.mlir"
     "pad.mlir"
+    "pow.mlir"
     "reduce.mlir"
     "reduce_window.mlir"
     "remainder.mlir"