code review 871042: runtime: turn run time errors checks into panics

src/cmd/cov/main.c

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 /*
  * code coverage
  */
 
 #include <u.h>
 #include <time.h>
@@ skipping 183 matching lines @@
                 // check whether last instruction is call to morestack.
                 // the -5 below is the length of
                 //      CALL sys.morestack.
                 buf[0] = 0;
                 machdata->das(text, epc-5, 0, buf, sizeof buf);
                 if(strstr(buf, "morestack"))
                         return;
         }
 
         if(epc - pc == 5) {
-                // check for CALL sys.throwindex
+                // check for CALL sys.panicindex
                 buf[0] = 0;
                 machdata->das(text, pc, 0, buf, sizeof buf);
-                if(strstr(buf, "throwindex"))
+                if(strstr(buf, "panicindex"))
                         return;
         }
 
         if(epc - pc == 2 || epc -pc == 3) {
                 // check for XORL inside shift.
                 // (on x86 have to implement large left or unsigned right shift with explicit zeroing).
                 //      f+90 0x00002c9f CMPL    CX,$20
                 //      f+93 0x00002ca2 JCS     f+97(SB)
                 //      f+95 0x00002ca4 XORL    AX,AX <<<
                 //      f+97 0x00002ca6 SHLL    CL,AX
@@ skipping 253 matching lines @@
         breakpoints.cmp = rangecmp;
         cover();
         n = go();
         walktree(breakpoints.root);
         if(chatty)
                 print("%d breakpoints\n", n);
         detachproc(mem);
         exits(0);
 }