Add intrinsics for compile-time computing trimMargin/trimIndent

These only apply when the receiver can be resolved to a constant and the margin prefix, if specified, is also a constant.

compiler/testData/codegen/bytecodeText/intrinsicsTrim/trimIndentNegative.kt

@@ -0,0 +1,20 @@
+fun notConstant(arg: String): String {
+    return arg.trimIndent()
+}
+
+fun interpolated(arg: Int):String {
+    return """
+        Hello,
+        $arg
+    """.trimIndent()
+}
+
+fun notInvoked():String {
+    return """
+        Hello,
+        World
+    """
+}
+
+// 1 LDC "\\n        Hello,\\n        World\\n    "
+// 2 INVOKESTATIC kotlin/text/StringsKt.trimIndent