Revert "roachtest: enable jemalloc profiling in all roachtests"

This reverts commit 2d69b3d.

Release note: None

pkg/cmd/roachtest/cluster.go

@@ -2124,20 +2124,12 @@ func (c *cluster) StartE(ctx context.Context, opts ...option) error {
 	}
 	args = append(args, roachprodArgs(opts)...)
 	args = append(args, c.makeNodes(opts...))
-	// Enable Jemalloc profiles for all roachtests. This has only
-	// minimal performance impact and significantly improves the
-	// troubleshootability of memory-related issues.
-	args = append(args, enableJemallocArgs()...)
 	if !argExists(args, "--encrypt") && c.encryptDefault {
 		args = append(args, "--encrypt")
 	}
 	return execCmd(ctx, c.l, args...)
 }
 
-func enableJemallocArgs() []string {
-	return []string{"-e", "MALLOC_CONF=prof:true"}
-}
-
 // Start is like StartE() except it takes a test and, on error, calls t.Fatal().
 func (c *cluster) Start(ctx context.Context, t *test, opts ...option) {
 	FatalIfErr(t, c.StartE(ctx, opts...))