Refactor wimpy feature (#2507)

- Make it a common parameter in harness using either '-w', '--wimpy' or
'CL_WIMPY_MODE' environment variable.
- Remove all test specific wimpy variable.

---------

Co-authored-by: Kévin Petit <kpet@free.fr>

test_conformance/conversions/test_conversions.cpp

@@ -247,7 +247,6 @@ static int ParseArgs(int argc, const char **argv)
                     case 'h': gTestHalfs ^= 1; break;
                     case 'l': gSkipTesting ^= 1; break;
                     case 'm': gMultithread ^= 1; break;
-                    case 'w': gWimpyMode ^= 1; break;
                     case '[':
                         parseWimpyReductionFactor(arg, gWimpyReductionFactor);
                         break;
@@ -316,14 +315,6 @@ static int ParseArgs(int argc, const char **argv)
         }
     }
 
-    // Check for the wimpy mode environment variable
-    if (getenv("CL_WIMPY_MODE"))
-    {
-        vlog("\n");
-        vlog("*** Detected CL_WIMPY_MODE env                          ***\n");
-        gWimpyMode = 1;
-    }
-
     vlog("\n");
 
     PrintArch();
@@ -364,9 +355,6 @@ static void PrintUsage(void)
     vlog("\t\t-l\tToggle link check mode. When on, testing is skipped, and we "
          "just check to see that the kernels build. (Off by default.)\n");
     vlog("\t\t-m\tToggle Multithreading. (On by default.)\n");
-    vlog("\t\t-w\tToggle wimpy mode. When wimpy mode is on, we run a very "
-         "small subset of the tests for each fn. NOT A VALID TEST! (Off by "
-         "default.)\n");
     vlog(" \t\t-[2^n]\tSet wimpy reduction factor, recommended range of n is "
          "1-12, default factor(%u)\n",
          gWimpyReductionFactor);