Override USE category for Grantha and Tirhuta visargas to allow marks

src/gen-use-table.py

diff --git a/src/gen-use-table.py b/src/gen-use-table.py
index c725bb2..029e66e 100755
--- a/src/gen-use-table.py
+++ b/src/gen-use-table.py
@@ -368,7 +368,8 @@
 		# TODO: These are not in USE's override list that we have, nor are they in Unicode 12.0
 		if 0xA926 <= U <= 0xA92A: UIPC = Top
 		# TODO: https://github.com/harfbuzz/harfbuzz/pull/1037
-		if U == 0x11302: UIPC = Top
+		#  and https://github.com/harfbuzz/harfbuzz/issues/1631
+		if U in [0x11302, 0x11303, 0x114C1]: UIPC = Top
 		if U == 0x1171E: UIPC = Left
 		if 0x1CF8 <= U <= 0x1CF9: UIPC = Top