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/test/unit_test/helpers/string_to_hash_tests.cpp

@@ -12,6 +12,11 @@
 
 using NEO::Hash;
 
+TEST(ToLower, GiventStringThenChangeItToLowerCase) {
+    std::string ls = StringHelpers::toLower("SomeTEXT");
+    EXPECT_STREQ("sometext", ls.c_str());
+}
+
 TEST(CreateCombinedStrings, GivenSingleStringWhenCreatingCombinedStringThenDstStringMatchesSrcString) {
     std::string dstString;
     size_t dstStringSizeInBytes = 0;