[gcc(refs/users/iains/heads/darwin-gcc-8-3r0)] backport r267358 - Fix powerpc-darwin long double symbol exports.

[Iain D Sandoe]

https://gcc.gnu.org/g:7c6764300f932b467fe523023883bc7830e1466f

commit 7c6764300f932b467fe523023883bc7830e1466f
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Sun Nov 25 13:42:23 2018 +0000

    backport r267358 - Fix powerpc-darwin long double symbol exports.
    
    During 8.x, the rs6000 target-specific mangling was reorganised which uncovered
    a long-standing bug in Darwin’s mangling for ‘IBM’ long double.  Now the symbols
    are correctly mangled, and we end up with a bunch of test link fails.
    
    This patch adds the necessary subset of the Linux long double exports to Darwin’s
    export table.
    
    libstdc++/
    
    	backport from mainline
    	2018-12-22  Iain Sandoe  <iain@sandoe.co.uk>
    
    	* /config/os/bsd/darwin/ppc-extra.ver: Append long double symbols.

Diff:
---
 libstdc++-v3/config/os/bsd/darwin/ppc-extra.ver | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/libstdc++-v3/config/os/bsd/darwin/ppc-extra.ver b/libstdc++-v3/config/os/bsd/darwin/ppc-extra.ver
index ffe32b6..f0aee9e8 100644
--- a/libstdc++-v3/config/os/bsd/darwin/ppc-extra.ver
+++ b/libstdc++-v3/config/os/bsd/darwin/ppc-extra.ver
@@ -1 +1,22 @@
   __eprintf;
+# 3.4
+  _ZNSt14numeric_limitsIgE*;
+  _ZNSirsERg;
+  _ZNSolsEg;
+  _ZNSt13basic_istreamIwSt11char_traitsIwEErsERg;
+  _ZNSt13basic_ostreamIwSt11char_traitsIwEElsEg;
+  _ZSt14__convert_to_vIgEvPKcRT_RSt12_Ios_IostateRKP*;
+  _ZStlsIg[cw]St11char_traitsI[cw]EERSt13basic_ostreamIT0_T1_ES6_RKSt7complexIT_E;
+  _ZStrsIg[cw]St11char_traitsI[cw]EERSt13basic_istreamIT0_T1_ES6_RSt7complexIT_E;
+# 3.4.7
+  _ZNSi10_M_extractIgEERSiRT_;
+  _ZNSt13basic_istreamIwSt11char_traitsIwEE10_M_extractIgEERS2_RT_;
+  _ZNSo9_M_insertIgEERSoT_;
+  _ZNSt13basic_ostreamIwSt11char_traitsIwEE9_M_insertIgEERS2_T_;
+# 3.4.10
+  _ZNKSt3tr14hashIgEclEg;
+  _ZNKSt4hashIgEclEg;
+# ldbl 1.3
+  _ZT[IS]g;
+  _ZT[IS]Pg;
+  _ZT[IS]PKg;