explicitly mention self-modifying code

Author: RalfJung

llvm/docs/LangRef.rst

@@ -5227,10 +5227,15 @@ represents the inline assembler as a template string (containing the
 instructions to emit), a list of operand constraints (stored as a string), a
 flag that indicates whether or not the inline asm expression has side effects,
 and a flag indicating whether the function containing the asm needs to align its
-stack conservatively. The compiler's understanding of the semantics of the
-expression comes only from the list of operand constraints and the flags -- not
-the contents of the template string. In particular, no optimizations or analyses
-will be performed based on the contents of that string.
+stack conservatively.
+
+The compiler's understanding of the semantics of the expression comes only from
+the list of operand constraints and the flags -- not the contents of the
+template string. In particular, no optimizations or analyses will be performed
+based on the contents of that string. This ensures correct behavior if the
+assembly code emitted by this expression is altered later, e.g. via
+self-modifying code, as long as the code keeps upholding the requirements of the
+operand constraints and the flags.
 
 The template string supports argument substitution of the operands using "``$``"
 followed by a number, to indicate substitution of the given register/memory