clarify comment

Author: Marc Rasi

test/SILOptimizer/pound_assert.swift

@@ -97,24 +97,24 @@ func test_topLevelEvaluation(topLevelArgument: Int) {
 
 func test_trapsAndOverflows() {
   // The error message below is generated by the traditional constant folder.
-  // The constant folder responsible for #assert does not generate an overflow
+  // The interpreter responsible for #assert does not generate an overflow
   // error because the traditional constant folder replaces the condition with
-  // a constant before the #assert constant folder sees it.
+  // a constant before the #assert interpreter sees it.
   // expected-error @+1 {{arithmetic operation '124 + 92' (on type 'Int8') results in an overflow}}
   #assert((124 as Int8) + 92 < 42)
 
   // One error message below is generated by the traditional constant folder.
-  // The constant folder responsible for #assert does generate an additional
-  // error message.
+  // The interpreter responsible for #assert does generate an additional error
+  // message.
   // expected-error @+2 {{integer literal '123231' overflows when stored into 'Int8'}}
   // expected-error @+1 {{#assert condition not constant}}
   #assert(Int8(123231) > 42)
   // expected-note @-1 {{integer overflow detected}}
 
   // The error message below is generated by the traditional constant folder.
-  // The constant folder responsible for #assert does not generate an overflow
+  // The interpreter responsible for #assert does not generate an overflow
   // error because the traditional constant folder replaces the condition with
-  // a constant before the #assert constant folder sees it.
+  // a constant before the #assert interpreter sees it.
   // expected-error @+2 {{arithmetic operation '124 + 8' (on type 'Int8') results in an overflow}}
   // expected-error @+1 {{assertion failed}}
   #assert(Int8(124) + 8 > 42)