[java] IdenticalCatchBranches false positive with return expressions

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Affects PMD Version: 6.9.0

Rule: IdenticalCatchBranches

Description: False positive if only the return statement expression is different (true vs. false in the example below).

Code Sample demonstrating the issue:

pmd/pmd-java/src/main/java/net/sourceforge/pmd/lang/java/typeresolution/ClassTypeResolver.java

Lines 1393 to 1403 in e3ef72c

	public boolean classNameExists(String fullyQualifiedClassName) {
	try {
	pmdClassLoader.loadClass(fullyQualifiedClassName);
	return true; // Class found
	} catch (ClassNotFoundException e) {
	return false;
	} catch (LinkageError e2) {
	// Class exists, but may be invalid (see https://github.com/pmd/pmd/issues/1131)
	return true;
	}
	}

Running PMD through: Maven