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/trimIndentPositive.kt

@@ -0,0 +1,22 @@
+// IGNORE_BACKEND: JVM_IR
+
+fun constant(): String {
+    return """
+        Hello,
+        World
+    """.trimIndent()
+}
+
+private const val HAS_INDENT = """Hello,
+        World"""
+fun interpolatedUsingConstant(): String {
+    return """
+        Hello,
+        $HAS_INDENT
+        World
+    """.trimIndent()
+}
+
+// 1 LDC "Hello,\\nWorld"
+// 1 LDC "Hello,\\nHello,\\nWorld\\nWorld"
+// 0 INVOKESTATIC kotlin/text/StringsKt.trimIndent