Allow annotating inline assembly as memory-safe.

test/libsolidity/syntaxTests/inlineAssembly/invalid_natspec.sol

@@ -0,0 +1,14 @@
+contract C {
+	function f() public pure {
+		/// @test test
+		assembly {}
+		/// @solidity test
+		assembly {}
+		/// @param
+		assembly {}
+	}
+}
+// ----
+// Warning 6269: (60-71): Unexpected natspec tag in inline assembly: test
+// Warning 8787: (95-106): Unexpected value for @solidity tag in inline assembly: test
+// Warning 7828: (122-133): Inline assembly has invalid natspec documentation.

test/libsolidity/syntaxTests/inlineAssembly/natspec_memory_safe.sol

@@ -0,0 +1,6 @@
+contract C {
+	function f() public pure {
+		// @solidity memory-safe-assembly
+		assembly {}
+	}
+}