Bug 1842810: Handle number overflow in AddTimeDaysSlow. r=spidermonkey-reviewers,mgaudet

This code will likely be removed when <tc39/proposal-temporal#2612> lands.

Differential Revision: https://phabricator.services.mozilla.com/D189814

UltraBlame original commit: 8941d99e1eb17454a255df18d412ab32963d6aae

Author: marco-c

js/src/builtin/temporal/PlainDateTime.cpp

@@ -4250,6 +4250,14 @@ weeks
 daysResult
 }
 ;
+MOZ_ASSERT
+(
+IsValidDuration
+(
+duration
+)
+)
+;
 /
 /
 Step

js/src/builtin/temporal/PlainTime.cpp

@@ -8855,8 +8855,42 @@ return
 false
 ;
 }
-*
-result
+/
+/
+The
+days
+number
+is
+used
+as
+the
+input
+for
+a
+duration
+.
+Throw
+if
+the
+BigInt
+/
+/
+when
+converted
+to
+a
+Number
+can
+'
+t
+be
+represented
+in
+a
+duration
+.
+double
+daysNumber
 =
 BigInt
 :
@@ -8866,6 +8900,38 @@ numberValue
 days
 )
 ;
+if
+(
+!
+ThrowIfInvalidDuration
+(
+cx
+{
+0
+0
+0
+daysNumber
+}
+)
+)
+{
+return
+false
+;
+}
+MOZ_ASSERT
+(
+IsInteger
+(
+daysNumber
+)
+)
+;
+*
+result
+=
+daysNumber
+;
 return
 true
 ;
@@ -9850,6 +9916,14 @@ return
 false
 ;
 }
+MOZ_ASSERT
+(
+IsInteger
+(
+days
+)
+)
+;
 *
 result
 =