fix: Better IR file format ext handling

This fix makes ocloc honor IR file format when picking
extension for the output file.
Additionally, this commit removes reduntant IR output when
compiling from IR.

Related-To: NEO-15876

Signed-off-by: Chodor, Jaroslaw <jaroslaw.chodor@intel.com>

shared/source/helpers/string_helpers.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2021-2022 Intel Corporation
+ * Copyright (C) 2021-2025 Intel Corporation
  *
  * SPDX-License-Identifier: MIT
  *
@@ -10,6 +10,7 @@
 
 #include "CL/cl.h"
 
+#include <algorithm>
 #include <cstdint>
 #include <cstring>
 #include <string>
@@ -83,4 +84,14 @@ inline std::vector<std::string> split(const std::string &input, const char *deli
 inline uint32_t toUint32t(const std::string &input) {
     return static_cast<uint32_t>(std::stoul(input, nullptr, 0));
 }
+
+inline void toLowerInPlace(std::string &src) {
+    std::transform(src.begin(), src.end(), src.begin(), [](unsigned char c) { return std::tolower(c); });
+}
+
+inline std::string toLower(const std::string &src) {
+    std::string ret = src;
+    toLowerInPlace(ret);
+    return ret;
+}
 } // namespace StringHelpers