CogVM source as per VMMaker.oscog-eem.3031

macOS: Fix a regression in sqMacUnixExternalPrims.m.

Slang: exclude CogMIPSELCompiler from generation.

Cogit: reimplement profiling support for AndreasSystemProfiler:

- check the profile clock *after* a primitive has succeeded, not before.
  testing before is clearly broken (what was I thinking?!?!?).
- use the same support that ioHighResClock uses; hence no AArch32 support for
  now (but we could put a SIGSEGV handler around an initial invocation to
  check if support is available).
- Add a new operand type for CogRTLOpcodes; L means "live registers" and allows
  the code generators to generate tight code for MovePerfCnt64RRL &
  MovePerfCnt64RL, avoiding saving registers that are not live.
- rewrite compileInterpreterPrimitive:flags: to split off the sideways call,
  and make the flow through a normal call, retry, prodflie sample sequence.

Frame printing: go some way to printing strings better for arg fields of a
frame.  The issue is string arguments, e.g. those with all of ASCII using
in translate:from:to:using:

Nuke the longRunningPrimitive sampling support.  it' a poor idea compared to
Andreas' accurate primitive profiling.

platforms/iOS/vm/OSX/sqMacUnixExternalPrims.m

@@ -199,6 +199,9 @@
 		return NULL;
 #endif
 
+#if 0 // This seems like the right thing to do but it breaks ioLoadModule
+	  // ioLoadModule for system dylibs found along the system path(2).
+	  // Instead, filter-out noise errors below
 	if (stat(libName, &buf)) {
 		dprintf((stderr, "tryLoadingLinked(%s) does not exist\n", libName));
 		return 0;
@@ -207,6 +210,7 @@
 		dprintf((stderr, "tryLoadingLinked(%s) is a directory\n", libName));
 		return 0;
 	}
+#endif
 
 	handle = dlopen(libName, RTLD_NOW | RTLD_GLOBAL);
 #if DEBUG
@@ -215,6 +219,15 @@
 #endif
 	if (!handle) {
 		const char *why = dlerror();
+		// filter out failures due to non-existent libraries
+		if (stat(libName, &buf)) {
+			dprintf((stderr, "tryLoadingLinked(%s) does not exist\n", libName));
+			return 0;
+		}
+		else if (S_ISDIR(buf.st_mode)) {
+			dprintf((stderr, "tryLoadingLinked(%s) is a directory\n", libName));
+			return 0;
+		}
 #if PRINT_DL_ERRORS // In practice these reasons are too important to hide
 		fprintf(stderr, "tryLoadingLinked(%s):\t%s\n", libName, why);
 #else

spur64src/vm/cogit.h

@@ -1,5 +1,5 @@
 /* Automatically generated by
-	CCodeGenerator VMMaker.oscog-eem.3026 uuid: 88faccd6-8d42-4e14-9ad3-104e5a5bc8d9
+	CCodeGenerator VMMaker.oscog-eem.3031 uuid: 51e5e6bf-af1a-465a-bcff-a8874301d2ab
  */