test: fix timeout of test-heap-prof.js in riscv devices

In riscv hardware test-heap-prof.js caused timeout in test.
Because of weak performance.
So there is a need to set TIMEOUT_SCALEFACTOR for riscv too.

Fixes: #40152
PR-URL: #42674
Reviewed-By: James M Snell <jasnell@gmail.com>

tools/test.py

@@ -909,10 +909,11 @@ def GetTestStatus(self, context, sections, defs):
 
 
 TIMEOUT_SCALEFACTOR = {
-    'arm'   : { 'debug' :  8, 'release' : 3 }, # The ARM buildbots are slow.
-    'ia32'  : { 'debug' :  4, 'release' : 1 },
-    'ppc'   : { 'debug' :  4, 'release' : 1 },
-    's390'  : { 'debug' :  4, 'release' : 1 } }
+    'arm'       : { 'debug' :  8, 'release' : 3 }, # The ARM buildbots are slow.
+    'riscv64'   : { 'debug' :  8, 'release' : 3 }, # The riscv devices are slow.
+    'ia32'      : { 'debug' :  4, 'release' : 1 },
+    'ppc'       : { 'debug' :  4, 'release' : 1 },
+    's390'      : { 'debug' :  4, 'release' : 1 } }
 
 
 class Context(object):

tools/utils.py

@@ -97,6 +97,8 @@ def GuessArchitecture():
     return 'ppc'
   elif id == 's390x':
     return 's390'
+  elif id == 'riscv64':
+    return 'riscv64'
   else:
     id = platform.processor()
     if id == 'powerpc':